The Trump administration wants to build a 30-foot-high border wall that looks good from the north side and is difficult to climb or cut through, according to a pair of contract notices posted to a government website further detailing President Donald Trump's promise to build a "big, beautiful wall" at the Mexican border.

The notices were made public last night by Customs and Border Protection, the Homeland Security Department agency that will oversee the project and eventually patrol and maintain the wall. The proposals are due to the government by March 29.

One of the CBP contract requests calls for a solid concrete wall, while the other asks for proposals for a see-through structure. Both require the wall to sunk at least six feet into the ground and include 25- and 50-foot automated gates for pedestrians and vehicles. The proposed wall must also be built in a such a way that it would take at least an hour to cut through it with a "sledgehammer, car jack, pick axe, chisel, battery operated impact tools, battery operated cutting tools, Oxy/acetylene torch or other similar hand-held tools."

The government will award a contract based on 30-foot-wide sample walls that are to be built in San Diego. This is the second time the Trump administration has asked for private companies to bid on building the wall. Last month CPB put out a call for "concept papers" to design and build prototypes by March 10.

Trump has bragged in recent days that the wall is ahead of schedule, though it's unclear from the latest contract notices if any firms have submitted wall proposals or if any such submissions have been rejected.

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